2025 tropical cyclone season · central North Pacific
Hurricane Iona Iona · CP012025
Hurricane Iona was tracked in the central North Pacific from 2025-07-26 to 2025-08-01 (7 days), peaking at 115 kt (H4) with a minimum pressure of 956 hPa. 195 archived forecasts from NHC, ECMWF, ECMWF ENS, GFS, GEFS, Google DeepMind are verified against its best track; at 48 hours the closest was ECMWF ENS, 85 km off on average.
- ATCF ID
- CP012025
- Basin
- central North Pacific
- Tracked
- 2025-07-26 → 2025-08-01 (7 days)
- Peak wind
- 115 kt · 59 m/s · H4
- Minimum pressure
- 956 hPa
- Archived forecasts
- 195
- Sources
- NHC · ECMWF · ECMWF ENS · GFS · GEFS · Google DeepMind
Forecast track error (km)
| Source | 24 h | 48 h | 72 h | 120 h |
|---|---|---|---|---|
| NHC | 71 (18) | 136 (14) | 145 (10) | 193 (2) |
| ECMWF | 64 (19) | 90 (15) | 120 (11) | 173 (2) |
| ECMWF ENS | 58 (17) | 85 (13) | 116 (10) | 150 (3) |
| GFS | 85 (19) | 196 (15) | 334 (11) | 322 (3) |
| GEFS | 73 (19) | 162 (15) | 244 (11) | 324 (3) |
| Google DeepMind | 48 (16) | 89 (13) | 127 (8) | — |
Mean great-circle distance to the best track at each lead time, counted while the system was a tropical or subtropical cyclone; the number of cases is in brackets.
Best track
Six-hourly positions of the US best track (JTWC / NHC, one-minute winds); grades on the Saffir–Simpson scale.
| Time (UTC) | Position | Wind (kt) | Pressure (hPa) | Grade |
|---|---|---|---|---|
| 2025-07-26 00Z | 10.5°N 140.9°W | 25 | 1009 | TD |
| 2025-07-26 06Z | 10.7°N 141.6°W | 25 | 1009 | TD |
| 2025-07-26 12Z | 10.8°N 142.3°W | 25 | 1009 | TD |
| 2025-07-26 18Z | 10.9°N 143.1°W | 25 | 1009 | TD |
| 2025-07-27 00Z | 10.9°N 144.1°W | 25 | 1008 | TD |
| 2025-07-27 06Z | 10.9°N 145.1°W | 30 | 1007 | TD |
| 2025-07-27 12Z | 10.9°N 146.0°W | 30 | 1007 | TD |
| 2025-07-27 18Z | 10.9°N 146.9°W | 35 | 1006 | TS |
| 2025-07-28 00Z | 10.9°N 147.8°W | 40 | 1005 | TS |
| 2025-07-28 06Z | 10.8°N 148.8°W | 45 | 1004 | TS |
| 2025-07-28 12Z | 10.7°N 149.7°W | 55 | 1001 | TS |
| 2025-07-28 18Z | 10.7°N 150.6°W | 65 | 996 | H1 |
| 2025-07-29 00Z | 10.8°N 151.6°W | 75 | 988 | H1 |
| 2025-07-29 06Z | 10.8°N 152.6°W | 100 | 970 | H3 |
| 2025-07-29 12Z | 10.8°N 153.7°W | 115 | 956 | H4 |
| 2025-07-29 18Z | 10.9°N 155.0°W | 110 | 960 | H3 |
| 2025-07-30 00Z | 11.0°N 156.4°W | 100 | 968 | H3 |
| 2025-07-30 06Z | 11.2°N 157.9°W | 90 | 976 | H2 |
| 2025-07-30 12Z | 11.4°N 159.6°W | 70 | 991 | H1 |
| 2025-07-30 18Z | 11.6°N 161.7°W | 55 | 1000 | TS |
| 2025-07-31 00Z | 11.8°N 163.8°W | 45 | 1002 | TS |
| 2025-07-31 06Z | 12.1°N 165.9°W | 45 | 1002 | TS |
| 2025-07-31 12Z | 12.5°N 167.9°W | 40 | 1004 | TS |
| 2025-07-31 18Z | 13.0°N 169.8°W | 40 | 1004 | TS |
| 2025-08-01 00Z | 13.4°N 171.7°W | 35 | 1006 | TS |
| 2025-08-01 06Z | 13.6°N 173.6°W | 30 | 1007 | TD |
| 2025-08-01 12Z | 13.8°N 175.5°W | 30 | 1007 | TD |